Some Be 9(d, pγ)Be 10 angular correlation measurements off the stripping peak

Abstract

Angular correlations, in the reaction and azimuthal planes, between protons and gamma rays from the first excited state of Be 10 in the reaction Be 9(d, pγ)Be 10, have been measured for four proton angles between 26° and 86° in the centre-of-mass system. For a pure stripping reaction, with l = 1 for the stripped neutron, only P 2 (cos θ p γ ) terms are allowed in the angular correlation function in the reaction plane. However, P 4 terms have been found, even on the stripping peak, indicating a compound-nucleus contribution to the reaction. Excitation functions for the reaction products of Be 9+d have been measured for incident energies from 3.8 to 6.3 MeV and these show an absence of resonances. Absolute differential cross-sections for the ground state and first excited state proton groups form the Be 9(d, p)Be 10 reaction have been measured at an incident energy of 5.86 MeV; these have been analysed in terms of the Butler stripping theory to give cut-off radii and reduced neutron widths.